Robert F. Luck

Klinikum Chemnitz

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Richard Stouthamer

University of California, Riverside

J. G. Morse

University of California, Riverside

Apostolos Kapranas

Aristotle University of Thessaloniki

C. L. Hohmann

Instituto Agronômico do Paraná

Lisa D. Forster

Universität Greifswald

G. T. Scriven

University of California, Riverside

William W. Murdoch

University of California, Santa Barbara

Leonard Nunney

University of California, Riverside

Julio S. Bernal

Texas A&M University

Donald L. Dahlsten

Feminist Archive South

Cooperative Institutions

University of California, Riverside

Agricultural Research Service

University of California, Berkeley

University of California System

United States Department of Agriculture

University of Florida

Institute of Entomology

Wageningen University & Research

University of California, Davis

University of Arizona

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COMPARISON OF TWO SAMPLING METHODS FOR THE JEFFREY PINE NEEDLE MINER, COLEOTECHNITES SP. (LEPIDOPTERA: GELECHIIDAE) IN SOUTHERN CALIFORNIA

The Canadian Entomologist (1982)

Thomas R. Unruh Robert F. Luck

Abstract Within and between tree distributions of the Jeffrey pine needle miner, Coleotechnites sp. and its food resource (needles), were investigated on Jeffrey pine trees at three locations in the San Bernardino Mountains of southern California. These data were used to compare sample allocation by the component of variance technique and a method based on the mean crowding relationship. The numbers of samples necessary to estimate the mean at a given precision differed between the techniques in some cases. The mean crowding technique offered several advantages which are fully discussed. A sampling design for the Jeffrey pine needle miner is proposed.

10.4039/ent114605-7

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Citations (1)

Scale Morphology Effects on Feeding Behavior and Biological Control Potential of Rhyzobius lophanthae (Coleoptera: Coccinellidae)

Annals of the Entomological Society of America (1995)

Jeffrey Y. Honda Robert F. Luck

Journal Article Scale Morphology Effects on Feeding Behavior and Biological Control Potential of Rhyzobius lophanthae (Coleoptera: Coccinellidae) Get access Jeffrey Y. Honda, Jeffrey Y. Honda Department of Entomology, University of California, Riverside, CA 92521. Search for other works by this author on: Oxford Academic Google Scholar Robert F. Luck Robert F. Luck Department of Entomology, University of California, Riverside, CA 92521. Search for other works by this author on: Oxford Academic Google Scholar Annals of the Entomological Society of America, Volume 88, Issue 4, 1 July 1995, Pages 441–450, https://doi.org/10.1093/aesa/88.4.441 Published: 01 July 1995 Article history Received: 27 June 1994 Accepted: 07 February 1995 Published: 01 July 1995

Luck

Annals

Entomology

Morphology

10.1093/aesa/88.4.441

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Citations (25)

Selfish element maintains sex in natural populations of a parasitoid wasp

Proceedings of the Royal Society B Biological Sciences (2001)

Richard Stouthamer M. van Tilborg Joan H. de Jong Leonard Nunney Robert F. Luck

Genomic conflicts between heritable elements with different modes of inheritance are important in the maintenance of sex and in the evolution of sex ratio. Generally, we expect sexual populations to exhibit a 1:1 sex ratio. However, because of their biology, parasitoid wasps often exhibit a female–biased sex ratio. Sex–ratio distorters can further alter this optimum, sometimes leading to the complete loss of sexual reproduction. In the parasitoid wasp Trichogramma kaykai ca. 4–26% of females in field populations are infected with a bacterial sex–ratio distorter, Wolbachia, allowing virgin mothers to produce daughters. In some micro–Hymenoptera these infections have led to the complete loss of sex, but in field populations of T. kaykai the proportion of individuals infected remains relatively stable. We tested several hypotheses to explain this low infection level, including ineficient and horizontal transmission of Wolbachia, suppressor genes negating the effect of Wolbachia and the presence of male–biasing sex–ratio distorters. Here, a male–biasing sex–ratio distorter, a parasitic B chromosome, causing females to produce only sons, keeps the frequency of Wolbachia low. The male–biasing factor of T. kaykai is the second known case of a B chromosome manipulating the reproduction of a parasitoid wasp.

Parasitoid wasp

Sex allocation

Sexual reproduction

Nasonia vitripennis

10.1098/rspb.2000.1404

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Citations (88)

Integrated pest management in California citrus.

Robert F. Luck

Source

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Sex ratios in field populations of two parasitoids (Hymenoptera: Chalcidoidea) of Coccus hesperidum L. (Homoptera: Coccidae)

Oecologia (1998)

Julio S. Bernal Robert F. Luck J. G. Morse

Coccidae

Coccus (insect)

10.1007/s004420050616

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Citations (44)

Bionomics of California Red Scale, Aonidiella aurantii (Maskell) (Homoptera: Diaspididae), on Orange Fruits, Leaves, and Wood in California's San Joaquin Valley

Environmental Entomology (1984)

Devin P. Carroll Robert F. Luck

Development and reproduction of California red scale (CRS)were monitored on navel orange trees in a grove in California's San Joaquin Valley between 1976 and 1978. Three generations were completed each year with a possible fourth on fruits. The number of crawlers settling in each succeeding generation in a given year increased on fruit, decreased on wood, and remained comparatively stable on leaves. Fruits were the most advantageous settling site, followed by leaves or green twigs, and wood the poorest. In general, CRS on the more favorable substrates had comparatively faster maturation, higher percentage of juvenile survivorship, and greater reproductive rates. Reproductive life span was little influenced by substrate. Sex ratios favored males on leaf tops, females on fruits, and usually females on wood. A large proportion of juvenile CRS died during cold winters, but hot summer temperatures had little apparent effect on survival. The parasitoid Comperiella bifasciata Howard completed three or four generations annually with highest percentage of parasitism in CRS on fruits and lowest in CRS on wood.

Diaspididae

Bionomics

San Joaquin

10.1093/ee/13.3.847

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Citations (18)

Effects of Host Size on Selected Fitness Components of Aphytis melinus and A. lingnanensis (Hymenoptera: Aphelinidae)

Annals of the Entomological Society of America (1986)

Susan B. Opp Robert F. Luck

Two congeneric ectoparasitoids, Aphytis lingnanensis Compere and A. melinus DeBach, discriminated among different-sized hosts of California red scale, Aonidiella aurantii (Maskell). Both parasitoids laid male eggs on small scales and females on large scales, but the scale on which A. melinus began to lay female eggs was smaller than that laid upon by A. lingnanensis. No differences in immature parasitoid mortality based on host size were detected. Over a certain range of scale sizes, female parasitoid size directly correlated with host size, and at intermediate host size female pupal size attained its maximum in both species. Potential fecundity, as predicted by female size, differed between the species. Also, A. melinus generally matured fewer ovarian eggs less quickly than A. lingnanensis. Influence of survival, size, and fecundity on competitive interactions between these parasitoid species are discussed.

Aphelinidae

10.1093/aesa/79.4.700

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Citations (96)

Sex Ratio and Quality in the Culturing of Parasitic Hymenoptera

Elsevier eBooks (1999)

Robert F. Luck Leonard Nunney Richard Stouthamer

Haplodiploidy

Sex allocation

10.1016/b978-012257305-7/50070-9

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Citations (10)

Variation in Life History Parameters of California Red Scale on Different Citrus Cultivars

Ecology (1990)

J. Daniel Hare Dicky S. Yu Robert F. Luck

We measured survival, growth rate, and initial egg complement of California red scale, Aonidiella aurantii, when reared on foliage and bark of four citrus cultivars in order to detrmine the extent that variation among citrus cultivars may introduce variation in the number and quality of scale for utilization by the introduced parasitoid Aphytis melinus. Among bark substrates, lemon (Citrus limon) and grapefruit (Citrus paradisi) were most suitable for scale survival and growth. Bark of mandarin (Citrus unshiu) was nearly unsuitable for California red scale survival, and bark of sweet orange (Citrus sinensis) was intermediate in suitability. Foliage was a more uniformly suitable substrate for California red scale in that variation in survival and adult sizes was generally insignificant when scale were reared on different cultivars. Substantial differences in concentrations of free animo acids and soluble protein occurred in foliage and bark among citrus cultivars, but these differences were not correlated with differences in scale performance. The more uniform densities and sizes of scale on leaves across cultivars may have contributed to the development of A. melinus' propensity to search the leaves on the tree's exterior more frequently and regularly than the bark on the tree's interior for individual scales suitable for the reproduction of female progeny.

Diaspididae

Citrus unshiu

Citrus × sinensis

10.2307/1938282

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Citations (40)

Heterozygosity and effective size in laboratory populations ofAphidius ervi [Hym.: Aphidiidae]

Entomophaga (1983)

Thomas R. Unruh William T. White Daniel Gonzalez‐Socoloske Gordon Gordh Robert F. Luck

10.1007/bf02372175

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Citations (40)